PDF too large for Gmail
A scanned PDF that opens fine on your laptop can still bounce from Gmail or Outlook. Tinolia compresses the PDF on the server so the message fits, and files are deleted within 1 hour.
Compose · 32 MB
contract-scan.pdf25 MB cap
Gmail's 25 MB is not 25 MB of PDF on disk
Personal Gmail limits outbound attachments to about 25 MB for the whole message. Outlook.com sits nearer 20 MB. Mail re-encodes attachments as text, which adds roughly a third, so a 22 MB PDF on disk can land above the cap on the wire.
Gmail attachments explain the personal-account limit. Aim under about 18 MB of real file for Gmail, and under about 14 MB when Outlook.com or a picky corporate mailbox is the other end.
The receiving server often has a lower cap
Gmail may let you click Send while the clinic, university, or Microsoft 365 mailbox on the other side sits at 10 MB. The bounce arrives later with a line about maximum message size.
Shrink before you attach. Waiting for the bounce wastes a day and still leaves you with the same heavy scan.
A Drive link is not the same as an attachment
Past the limit, Gmail often pulls the file into Drive and leaves a link in the thread. That is handy for a colleague with Google access. It fails when HR, a court portal, or an older Outlook build needs the PDF bytes in the message.
If they asked for an attachment for the record, compress until it stays an attachment. Use a link only when everyone agrees a link is enough.
Scanned pages weigh more than text PDFs
A text PDF exported from Word is mostly compact. A phone scan of every page is a stack of full-resolution images inside a PDF wrapper, which is why a ten-page contract balloons past 30 MB.
Compression downsamples those embedded images. Check small print, stamps, and signatures after you download. If one page must stay sharp, keep a higher-quality pass for that page and compress the rest harder.
Compress the PDF, then check the compose total
Compress PDF rewrites a smaller PDF on the server. Up to 10 files, 20 MB each. Files are deleted within 1 hour, or immediately from the download screen.
Attach the result and watch the size the compose window shows. If you still have several separate PDFs, Merge PDF can make one file after each piece is small enough, not before.
- Drop the oversized PDF on Compress PDF.
- Download the smaller file and confirm text and signatures still read.
- Attach it, check the message total, and delete the job from the screen when you are done.
Photos in the same message are a different job
If the bounce is from iPhone photos rather than a PDF, resize and compress the images first: photos for email. Mixing six HEIC files with a scan is how a message that looked fine per file still fails as a total.
Building a PDF from phone photos is iPhone to PDF. Stay here when the attachment is already a PDF and only the weight is wrong.
Questions
What is the Gmail attachment limit versus Outlook?
Personal Gmail sits near 25 MB for the whole outbound message. Outlook.com is often nearer 20 MB. Work mailboxes can be lower still, set by the admin.
Why is my PDF still rejected after I compressed it?
Encoding adds about a third on the wire, or the receiving server sits below Gmail's number. Compress again toward 18 MB or less, or ask IT what cap their mailbox actually uses.
Should I split the PDF into parts?
Splitting helps when one file must stay high quality. Send clearly named parts, and say how many emails to expect. Compress each part first when the weight is the only problem.
Is a Google Drive link better than attaching?
A Drive link works when the recipient can open Drive and a link is allowed. When they need the PDF in the thread for a record, compress until it stays an attachment.
Will compressing ruin scan quality?
Heavy scans lose fine detail first. Check stamps and small print after download. If a page must stay sharp, compress less on that document or rescan that page cleaner.
Does a digital signature survive compression?
Some signed PDFs break or show as modified after a rewrite. Keep a signed original aside, and confirm the signature status on the compressed copy before you send.
Does zipping the PDF help Gmail?
A ZIP of one PDF rarely gains much, and some inboxes block archives. Compress the PDF itself instead of wrapping it.
Why did corporate email bounce a file Gmail accepted?
Their Exchange or Microsoft 365 limit is often lower than Gmail's. Shrink to their number, or ask what maximum their IT published for that mailbox.
More guides like this
- Visa and government photos: the 50 KB fieldMaximum 50 KB is a ceiling, a range has a floor, and the DS-160 wants nearer 240 KB. Read the screen, crop the face, set the pixels, then hit the number.
- Reduce photo size for emailGmail sends 25 MB per message, Outlook.com sits nearer 20 MB, and encoding adds a third on top. Resize toward 1920 px first, then compress to JPEG.
- Why is my PNG so largePNG stores every pixel, so a 4K capture runs into megabytes. Convert it to JPEG when it is a photo, and compress the PNG when the text has to stay readable.